solve the following and express your answer with proper significant digits.

The answer of (d) is 2.47*10^-14 and (e) is 7.767*10^4

I don't understand why the answer says that sig fig... could you help me please?

Is there any sig fig rule related to it? like bracket rule??

I want to get detail explanation.

5. Solve the following and express your answer with proper significant digits. Note: For those with a TI-83, use the EE button for powers of 10. a) 3.407108m1.06108m b) 9.200106m2.3105m c) 5.020104s3.7140109m d) (8.4623105s)22(2.81103m) e) 42(8.805102s)2700106m